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The idea is to test the stone face for smoothness.

By lightly running an un-tapped razor on the stone you will feel and hear any imperfections on the surface, before you put the good razor on it....

Which is why you should test with a beater/test razor and lightly polish the stone face with a hard tomo or small Ark.

Polish the stone face with a hard tomo, do 1 inch at a time using light...

Yea, if you have a lot of lapping to do on a hard stone, 60 grit Silicon Carbide on a steel cookie sheet, will dramatically cut your time. And cost but a few bucks. You can go up to 500 with loose...

How are you judging, flatness, the removal of the pencil lines?

If so, yes, your slurry is washing off the pencil and the stone is not flat. The DLGP, Iwood and the CKTG plates have grid lines...